Angular Deviation

Q. Find the angle of deviation for the incident ray.

1. ${120}^{\circ }$
2. ${60}^{\circ }$
3. ${90}^{\circ }$
4. ${135}^{\circ }$

Q. Two plane mirrors are arranged as shown in the figure. A ray has been incident on one of the mirrors at an angle of ${40}^{\circ }$. The deviations produced in the incident ray after three successive reflections will be

1. ${40}^{\circ }$ clockwise
2. ${40}^{\circ }$ anticlockwise
3. ${140}^{\circ }$ anticlockwise
4. ${140}^{\circ }$ clockwise

Q. Two plane mirrors are arranged as shown in the figure. A ray has been incident on one of the mirrors at an angle of ${40}^{\circ }$. The deviations produced in the incident ray after three successive reflections will be

1. ${40}^{\circ }$ clockwise
2. ${40}^{\circ }$ anticlockwise
3. ${140}^{\circ }$ anticlockwise
4. ${140}^{\circ }$ clockwise

Q. Choose the correct option for the given assertion and reason.
Assertion: Two plane mirrors kept at right angle deviate any ray of light by ${180}^{\circ }$ after two successive reflections.
Reason: The above condition is satisfied only for angle of incidence, $i={45}^{\circ }$.

1. Assertion and reason both are correct and reason is the correct explanation of assertion.
2. Assertion and reason both are correct and reason is not a correct explanation of assertion.
3. Assertion is correct, but reason is not correct.
4. Assertion is not correct, but reason is correct.

Q. A ray of light incidents on a plane mirror at an angle ${30}^{\circ }$, calculate the angular deviation of the reflected ray.

1. ${60}^{\circ }$
2. ${75}^{\circ }$
3. ${120}^{\circ }$
4. ${90}^{\circ }$